Bends, if any, along the part length should not cause the part to breach the runout tolerance zone. In the case of cylindrical parts, besides controlling surface irregularities, total runout controls any axial variations in a part. All points on the surface must lie within the tolerance zone, and the difference between the highest and the lowest point on the entire surface must be less than the applied tolerance limit.
It does so by specifying a datum axis and rotating the part by 360 degrees.Īny peaks and valleys on the surface are observed with respect to the applied total runout tolerance zone. Total runout is a composite tolerance that controls the location, orientation and cylindricity of the entire surface simultaneously. VII Important points to remember What is Total Runout?
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